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 ÀûÓÃAJAX¶¯Ì¬»ñÈ¡µ±Ç°Ê±¼ä£¬¿Í»§¶Ëtime.php,·þÎñÆ÷¶Ëtime_check.php
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>¶¯Ì¬ÏÔʾʱ¼ä</title>
</head>
<script language="javascript">
var xmlHttp;
function createXMLHttpRequest(){
 if(window.ActiveXObject){
  xmlHttp = new ActiveXObject("microsoft.XMLHTTP");
 }
 else if(window.XMLHttpRequest){
  xmlHttp = new XMLHttpRequest();
 }
 else{
  alert("´´½¨ÇëÇóʧ°Ü");
 }
}
function sendRequest(){
 createXMLHttpRequest();
 url = "time_check.php";
 xmlHttp.onreadystatechange = callback;
 xmlHttp.open('GET',url,true);
 xmlHttp.send(null);
}
function callback(){
 if(xmlHttp.readyState ==4){
  if(xmlHttp.status == 200){
   document.getElementById("time").innerHTML = xmlHttp.responseText;
   setTimeout("sendRequest()",1000);
  }
 }
}
</script>
<body>
<input type="button" value="check it" onclick="sendRequest();" />
<br/>
<span id="time"></span>
</body>
</html>
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<?php
header("cache-control:no-cache,must-revalidate"); //È¡ÏûphpÒ³Ã滺´æµÄÉèÖÃ
header('Content-type: text/html;charset=GB2312');
$showtime = date("±±¾©Ê±¼äYÄêmÔÂdÈÕH:i:s");
echo $showtime;
?>


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asp.net ajax ÀàÐÍϵͳdemo

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Type.registerNamespace("Demo");
Demo.Message=function(content,publishTime)
{
this._content = content;
this._publishTime = publishTime;
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